diff --git a/eo/src/eoContinue.h b/eo/src/eoContinue.h
index d3b45f36..692d01f3 100644
--- a/eo/src/eoContinue.h
+++ b/eo/src/eoContinue.h
@@ -40,12 +40,12 @@ public:
   virtual std::string className(void) const { return "eoContinue"; }
 
   void readFrom (std :: istream & __is) {
-    
+      (void)__is;
     /* It should be implemented by subclasses ! */
   }
   
   void printOn (std :: ostream & __os) const {
-    
+      (void)__os;
     /* It should be implemented by subclasses ! */
   }
 };
diff --git a/eo/src/eoEvalContinue.h b/eo/src/eoEvalContinue.h
index d92bef31..7ee38dee 100644
--- a/eo/src/eoEvalContinue.h
+++ b/eo/src/eoEvalContinue.h
@@ -43,6 +43,7 @@ public:
   /** Returns false when a certain number of evaluations has been done
    */
   virtual bool operator() ( const eoPop<EOT>& _vEO ) {
+      (void)_vEO;
     if (eval.value() >= repTotalEvaluations) 
       {
 	std::cout << "STOP in eoEvalContinue: Reached maximum number of evaluations [" << repTotalEvaluations << "]\n";
diff --git a/eo/src/eoSelectOne.h b/eo/src/eoSelectOne.h
index 7896138a..dc8a3b1c 100644
--- a/eo/src/eoSelectOne.h
+++ b/eo/src/eoSelectOne.h
@@ -47,7 +47,9 @@ class eoSelectOne : public eoUF<const eoPop<EOT>&, const EOT&>
     public :
       /// virtual function to setup some population stats (for instance eoProportional can benefit greatly from this)
       virtual void setup(const eoPop<EOT>& _pop)
-      {}
+      {
+	  (void)_pop;
+      }
 };